CUrious if anyone has done this? 180gal tank, in progress, adding a hydor 300w on the return from the 2262. If a single 300w doesn't turn out to be enough I'd rather not add an intank heater so besides all of the connections and the weight of the heaters on the return is there any reason not to do it? I can get a little fancy with the return and I can support the heaters no issue.